土工基础

›› 2015, Vol. 29 ›› Issue (4): 13-18.

• 工程实录 • 上一篇    下一篇

斜抛撑在基坑支护中控制土体应力与结构受力特点研究

林国威 1,左人宇 1,陆 钊 1,翟东格 2，卢镇文 3   

  1. （1.深圳市工勘岩土集团有限公司岩土工程设计所，广东深圳 518026; 2.哈尔滨工业大学深圳研究生院
    深圳市城市与土木工程防灾减灾重点实验室，广东深圳 518055；3.长沙供电公司，长沙 410000）
  • 收稿日期:2015-05-07 出版日期:2015-08-20 发布日期:2015-11-06
  • 作者简介:林国威（1983-），男，工程师，研究方向为岩土工程设计与数值分析。
  • 基金资助:

    基金项目：深圳市科技研发资金（项目编号CXZZ20120829154820942）

Structural Capacity of the Inclined Supporting System and Soil Stress in the Deep Excavation

LIN Guowei1, ZUO Renyu1, LU Zhao2, ZHAI Dongge2, LU Zhenwen3   

  1. (1. Division of Geotechnical Engineering Design, Shenzhen Gongkan Geotechnical Group Co., Ltd., Shenzhen 518026;
    2. Shenzhen Key Laboratory of Urban & Civil Engineering Disaster Prevention & Reduction, Harbin Institute of Technology Shenzhen Graduate School, Shenzhen 518055;3. State Grid Changsha Power Supply Co. Ltd., Changsha 410000)
  • Received:2015-05-07 Online:2015-08-20 Published:2015-11-06

摘要： 深大基坑的开挖支护内支撑体系中，一种斜抛撑的形式被越来越广泛地应用。通过大型通用有限元软件ABAQUS对支撑桩加承台的斜抛撑形式在深大基坑中的应用进行研究分析，并与常规应用的水平撑在深大基坑中的数值模拟结果进行对比，重点分析了基坑开挖过程中周围土体的应力状态与支护结构受力，同时比较两种不同的内支撑体系深大基坑外地表面土体沉降、基坑底部土体隆起及围护桩的水平位移不同变化情况，探讨斜抛撑的支护结构受力机理，并且得出支撑桩加承台的斜抛撑支护体系在控制围护桩水平位移和基坑外地表面土体沉降的优点及控制效果。

关键词: 水平支撑, 斜抛撑, 弯矩, 应力状态, 位移

Abstract: The inclined supporting system has received more and more applications in the large deep excavation projects. This paper presents the numerical analysis results of an inclined support system with pile cap by using commercial software ABAQUS. The results of the inclined supporting system are also compared with the results of the conventional horizontal strut system. The stresses in the two different supporting system are analyzed. Further, the stresses in the soil mass, ground subsidence, the bottom heave as well as the lateral deflection of the pile are also compared in details. The mechanism of the inclined structures and the advantages of this system in the control of the pile lateral deflection and the ground subsidence are also presented.

Key words: Horizontal Strut, Inclined Support, Bending Moment, Soil Stress, Ground Subsidence